Odd piece of equipment recommendations?

[tkav1980]

So as I wait for the time budget allows i want to set up a high/low pulley system I can clip onto my dip/pullup station. I have ideas on how to secure it to the station but can anyone recommend a specific single wheel pulley that can handle up to 200 lbs and has a single attachment point that doesnt require being bolted down?
I was thinking similar to a block and tackle but would like recommendations if anyone did something like this before.

 

[Piglett]

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Spud makes quality, this is rated for 550lb.

 

[Reload]

Plate carrier for "Murphs". 20+lbs
1 mile run
200 push ups
300 squats
1 mile run

Have level III+ plates at the ready
if things go sideways